Finding the Third Proportional to 921,776 and 1,917,128

Step by Step Solution

1. Step 1: Write the proportion equation
   921,776 : 1,917,128 = 1,917,128 : x
2. Step 2: Convert to fraction form
   921,776/1,917,128 = 1,917,128/x
3. Step 3: Cross multiply
   921,776x = 1,917,128 × 1,917,128
4. Step 4: Simplify right side
   921,776x = 3,675,379,768,384
5. Step 5: Solve for x
   x = 3,675,379,768,384/921,776
6. Step 6: Final answer
   x = 3,987,280.82